Mazda 626 Station Wagon, Workshop Manual

Page: 570 / 577

TROUBLESHOOTING
STEP
INSPECTION
ACTION
*13 INSPECT WIRING HARNESS BETWEEN
REFRIGERANT PRESSURE SWITCH AND A/C
AMPLIFIER FOR CONTINUITY
• Turn ignition switch to LOCK position.
• Is there continuity between A/C amplifier
connector terminal B (A/C signal) and
refrigerant pressure switch connector terminal
B?
Yes Go to next step.
No Repair wiring harness between refrigerant
pressure switch and A/C amplifier, then go to Step
25.
*14 INSPECT WIRING HARNESS FOR
CONTINUITY BETWEEN CLIMATE CONTROL
UNIT AND A/C AMPLIFIER
• Disconnect climate control unit
connector(16-pin).
• Is there continuity between climate control unit
connector (16-pin) terminal 2D and A/C
amplifier connector terminal C?
Yes Go to next step.
No Repair wiring harness between climate control
unit and A/C amplifier, then go to Step 25.
*15 CHECK TO SEE WHETHER MALFUNCTION
(SHORT TO B+) IS IN CLIMATE CONTROL
UNIT OR WIRING HARNESS (BETWEEN
CLIMATE CONTROL UNIT AND A/C
AMPLIFIER)
• Turn ignition switch to ON position.
• Test voltage at A/C amplifier connector terminal
C (A/C signal).
• Is voltage approximately 12 V?
Yes
Repair wiring harness between climate control
unit and A/C amplifier, then go to Step 25.
No Replace climate control unit, then go to Step 25.
*16 CHECK TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY) IS IN PCM AND
WIRING HARNESS (BETWEEN PCM AND
REFRIGERANT PRESSURE SWITCH) OR
ELSEWHERE
• Turn ignition switch to ON position.
• Test voltage at refrigerant pressure switch
connector terminal A (A/C signal) on wiring
harness side.
• Is voltage approximately 12 V?
Yes Go to Step 18.
No Go to next step.
*17 CHECK TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY) IS IN PCM OR
WIRING HARNESS (BETWEEN PCM AND
REFRIGERANT PRESSURE SWITCH)
• Test voltage at PCM connector terminal 41
(A/C signal).
• Is voltage approximately 12 V?
Yes Repair wiring harness between PCM and
refrigerant pressure switch, then go to Step 25.
No
Inspect PCM, then go to Step 25.
18 CHECK TO SEE WHETHER MALFUNCTION IS
IN REFRIGERANT PRESSURE SWITCH OR
ELSEWHERE
• When refrigerant pressure switch connector
terminals A and B (on wiring harness side) are
shorted, does cool air blow out?
Yes Inspect refrigerant pressure switch, then go to
Step 25.
No Undo short, reconnect refrigerant pressure switch,
then go to next step.
19 INSPECT A/C RELAY (COIL-SIDE) POWER
SUPPLY FUSE
• Is A/C replay power supply fuse okay?
Yes Go to next step.
No Check for a short to ground on blown fuse’s
circuit.
Repair or replace as necessary.
Install appropriate amperage fuse
*20 INSPECT WIRING HARNESS BETWEEN FUSE
BLOCK AND A/C RELAY (COIL-SIDE) FOR
CONTINUITY
• Turn ignition switch to ON position.
• Test voltage at A/C relay connector terminal A
(IG1 signal).
• Is voltage approximately 12 V?
Yes Go to next step.
No Repair wiring harness between fuse block and
A/C relay, then go to Step 25.
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